uniapp中sqlite数据库常用操作的简单封装

简介: uniapp中sqlite数据库常用操作的简单封装

深入浅出:uniapp中SQLite数据库的常用操作封装

在移动应用开发过程中,SQLite数据库以其轻量级、跨平台、自包含等特点被广泛使用。uniapp作为近年来兴起的跨平台开发框架,同样支持对SQLite数据库的操作。本文将详细介绍如何在uniapp中封装SQLite数据库的常用操作,以便更高效地进行数据存取。

准备工作

在开始之前,请确保你的uniapp项目已经正确配置并安装了SQLite插件。一般来说,你需要在项目的manifest.json文件中配置相关插件信息,并在项目中导入对应的模块。

数据库操作封装的重要性

在实际开发中,我们往往需要对数据库进行频繁的增删改查操作。如果每次都写一遍完整的SQL语句并执行,不仅代码冗余,而且维护起来也非常困难。因此,将常用的数据库操作封装成函数,可以大大提高代码的复用性和可维护性。

封装常用操作

1. 打开/创建数据库

在使用SQLite数据库之前,我们需要先打开或创建一个数据库。这个操作可以封装成一个函数,方便后续调用。

function openDatabase(dbName, storeName) {
  if (!uni.openDatabase) {
    console.error('当前环境不支持SQLite数据库');
    return null;
  }
  return uni.openDatabase({
    name: dbName,
    location: 'default',
    storeName: storeName
  });
}

2. 执行SQL语句

执行SQL语句是数据库操作的核心。我们可以封装一个通用的执行函数,接收SQL语句和参数作为输入,返回执行结果。

async function executeSQL(db, sql, params = []) {
  return new Promise((resolve, reject) => {
    db.transaction((tx) => {
      tx.executeSql(sql, params, (tx, res) => {
        resolve(res);
      }, (tx, err) => {
        reject(err);
      });
    });
  });
}


3. 插入数据

插入数据是常见的数据库操作之一。我们可以封装一个插入函数,接收表名、数据对象作为参数,自动生成SQL语句并执行。

async function insertData(db, tableName, data) {
  let columns = Object.keys(data).join(',');
  let placeholders = Object.keys(data).map(() => '?').join(',');
  let sql = `INSERT INTO ${tableName} (${columns}) VALUES (${placeholders})`;
  try {
    let res = await executeSQL(db, sql, Object.values(data));
    return res.insertId;
  } catch (err) {
    throw err;
  }
}

4. 查询数据

查询数据也是非常常见的操作。我们可以封装一个查询函数,接收表名、查询条件等参数,返回查询结果。

async function queryData(db, tableName, conditions = {}) {
  let whereClause = Object.entries(conditions).map(([key, value]) => `${key} = ?`).join(' AND ');
  let sql = `SELECT * FROM ${tableName}`;
  let params = [];

  if (whereClause) {
    sql += ` WHERE ${whereClause}`;
    params.push(...Object.values(conditions));
  }

  try {
    let res = await executeSQL(db, sql, params);
    return res.rows;
  } catch (err) {
    throw err;
  }
}

5. 更新数据

更新数据操作同样可以封装成一个函数,接收表名、更新数据和查询条件作为参数。

async function updateData(db, tableName, updateData, conditions) {
  let setClause = Object.entries(updateData).map(([key, value]) => `${key} = ?`).join(', ');
  let whereClause = Object.entries(conditions).map(([key, value]) => `${key} = ?`).join(' AND ');
  let sql = `UPDATE ${tableName} SET ${setClause}`;
  let params = [...Object.values(updateData)];

  if (whereClause) {
    sql += ` WHERE ${whereClause}`;
    params.push(...Object.values(conditions));
  }

  try {
    let res = await executeSQL(db, sql, params);
    return res.rowsAffected;
  } catch (err) {
    throw err;
  }
}

6. 删除数据

删除数据操作与更新数据类似,也需要指定删除条件和表名。

async function deleteData(db, tableName, conditions) {
  let whereClause = Object.entries(conditions).map(([key, value]) => `${key} = ?`).join(' AND ');
  let sql = `DELETE FROM ${tableName}`;
  let params = [];

  if (whereClause) {
    sql += ` WHERE ${whereClause}`;
    params.push(...Object.values(conditions));
  }

  try {
    let res = await executeSQL(db, sql, params);
    return res.rowsAffected;
  } catch (err) {
    throw err;
  }
}

使用示例

下面是一个简单的使用示例,展示了如何使用上面封装的函数进行数据库操作。

let db = openDatabase('mydb', 'mydbstore');

// 插入数据
insertData(db, 'users', {
  name: 'Alice',
  age: 25,
  email: 'alice@example.com'
}).then(id => {
  console.log(`插入成功,ID为:${id}`);
});

// 查询数据
queryData(db, 'users', {
  name: 'Alice'
}).then(users => {
  console.log('查询结果:', users);
});

// 更新数据
updateData(db, 'users', {
  age: 26
}, {
  name: 'Alice'
}).then(affectedRows => {
  console.log(`更新成功,影响了${affectedRows}行数据`);
});

// 删除数据
deleteData(db, 'users', {
  name: 'Alice'
}).then(affectedRows => {
  console.log(`删除成功,影响了${affectedRows}行数据`);
});

注意事项

  1. 在实际使用中,请确保对输入数据进行适当的验证和转义,以防止SQL注入攻击。
  2. 对于复杂的查询和操作,可能需要编写更复杂的SQL语句和函数。本文仅提供了最基本的封装示例。
  3. 在使用数据库时,请注意及时关闭数据库连接,释放资源。

通过封装常用的数据库操作,我们可以大大提高开发效率和代码质量。希望本文能对你在uniapp中使用SQLite数据库有所帮助!

案例实践

// 监听数据是否打开
function isOpenDB(name, path = "") {
  let dbName = name;
  let dbPath = path || `_doc/${name}.db`;
  //数据库打开了就返回true,否则返回false
  let isopen = plus.sqlite.isOpenDatabase({
    name: dbName,
    path: dbPath
  })
  return isopen
}
// 创建数据库/打开数据库
function openDB(name, path = "") {
  return new Promise((resolve, reject) => {
    plus.sqlite.openDatabase({
      name: name || 'test',
      path: path || `_doc/${name}.db`,
      success: async function(res) {
        let a = await closeDB(name)
        resolve('success!')
      },
      fail: async (e) =>{
        let a = await closeDB(name)
        console.log(e)
        reject(e);
      }
    });
  })
}

// 查询所有数据库表名
function queryDBTable(name, path = "") {
  return new Promise((resolve, reject) => {
    let isOpen = isOpenDB(name)
    if (isOpen) {
      plus.sqlite.selectSql({
        name: name,
        sql: "select * FROM sqlite_master where type='table'",
        success:async (e)=> {
          let a = await closeDB(name)
          resolve(e);
        },
        fail: async (e) =>{
          let a = await closeDB(name)
          console.log(e)
          reject(e);
        }
      })
    } else {
      plus.sqlite.openDatabase({
        name: name || 'test',
        path: path || `_doc/${name}.db`,
        success:async (res)=> {
          plus.sqlite.selectSql({
            name: name,
            sql: "select * FROM sqlite_master where type='table'",
            success:async (res)=> {
              let a = await closeDB(name)
              resolve(res);
            },
            fail: async (e) =>{
              let a = await closeDB(name)
              console.log(e)
              reject(e);
            }
          })
          
        },
        fail: async (e) =>{
          let a = await closeDB(name)
          console.log(e)
          reject(e);
        }
      });
    }


  })
}

/**
 * 创建表
 * data={dbname,tablename,describe}
 */
function createTable(data) {

  // 注意:tabName不能用数字作为表格名的开头
  return new Promise((resolve, reject) => {
    if (data.dbname && data.tablename && data.describe) {
      let {
        dbname,
        tablename,
        describe
      } = data
      let isOpen = isOpenDB(dbname)
      if (isOpen) {
        plus.sqlite.executeSql({
          name: dbname,
          // sql: 'create table if not exists dataList("list" INTEGER PRIMARY KEY AUTOINCREMENT,"id" TEXT,"name" TEXT,"gender" TEXT,"avatar" TEXT)',
          sql: `create table if not exists ${tablename}(${describe})`,
          success:async (e)=> {
            let a = await closeDB(dbname)
            resolve(`创建表${tablename}完成`);
          },
          fail:async (e) =>{
            let a = await closeDB(dbname)
            reject(e);
          }
        })
      } else {
        plus.sqlite.openDatabase({
          name: dbname,
          path: data.path || `_doc/${dbname}.db`,
          success: function(res) {
            plus.sqlite.executeSql({
              name: dbname,
              // sql: 'create table if not exists dataList("list" INTEGER PRIMARY KEY AUTOINCREMENT,"id" TEXT,"name" TEXT,"gender" TEXT,"avatar" TEXT)',
              sql: `create table if not exists ${tablename}(${JSON.parse(describe) })`,
              success:async (e)=> {
                let a = await closeDB(dbname)
                resolve(`创建表${tablename}完成`);
              },
              fail:async (e)=>{
                let a = await closeDB(dbname)
                reject(e);
              }
            })
          },
          fail:async (e)=> {
            let a = await closeDB(dbname)
            reject('打开数据库失败: ' + JSON.stringify(e))
          }
        });
      }

    } else {
      reject("参数不满足条件")
    }

  })
}

// 查询表是否存在
function isTable(name, tabName, path = "") {

  return new Promise((resolve, reject) => {
    let isOpen = isOpenDB(name)
    if (isOpen) {
      plus.sqlite.selectSql({
        name: name,
        sql: `select count(*) as isTable FROM sqlite_master where type='table' and name='${tabName}'`,
        success: async (e)=> {
          
          let a = await closeDB(name)
          resolve(e[0].isTable ? true : false);

        },
        fail: async (e) =>{
          let a = await closeDB(name)
          reject(e);

        }
      })
    } else {
      plus.sqlite.openDatabase({
        name: name,
        path: path || `_doc/${name}.db`,
        success:  function(res) {
          plus.sqlite.selectSql({
            name: name,
            sql: `select count(*) as isTable FROM sqlite_master where type='table' and name='${tabName}'`,
            success: async (e) => {
              let a = await closeDB(name)
              resolve(e[0].isTable ? true : false);
            },
            fail: async (e)=> {
              let a = await closeDB(name)
              reject(e);

            }
          })
        },
        fail: async function(e) {
          let a = await closeDB(name)
          reject('failed: ' + JSON.stringify(e))

        }
      });
    }

  })
}

/**
 * 添加数据
 * @param {String} name
 * @param {String} tabName
 * @param {Object} obj
 */
function addSaveData(name, tabName, obj, path = "") {
  return new Promise((resolve, reject) => {
    if (obj) {
      let keys = Object.keys(obj)
      let keyStr = keys.toString()
      let valStr = ''
      keys.forEach((item, index) => {
        if (keys.length - 1 == index) {
          valStr += ('"' + obj[item] + '"')
        } else {
          valStr += ('"' + obj[item] + '",')
        }
      })
      // console.log(valStr)
      let sqlStr = `insert into ${tabName}(${keyStr}) values(${valStr})`
      console.log(sqlStr)
      let isOpen = isOpenDB(name)
      if (isOpen) {
        plus.sqlite.executeSql({
          name: name,
          sql: sqlStr,
          success:async(e)=> {
            let a = await closeDB(name)
            resolve(e);
          },
          fail: async (e)=> {

            let a = await closeDB(name)
            reject(e);
          }
        })
      } else {
        console.log(path)
        plus.sqlite.openDatabase({
          name: name,
          path: path || `_doc/${name}.db`,
          success: function(res) {
            plus.sqlite.executeSql({
              name: name,
              sql: sqlStr,
              success:async (e)=> {
                let a = await closeDB(name)
                resolve(e);
              },
              fail:async (e) =>{
                let a = await closeDB(name)
                reject(e);
              }
            })

          },
          fail: async function(e) {
            let a = await closeDB(name)
            reject('failed: ' + JSON.stringify(e))
          }
        });
      }


    } else {
      reject("错误")
    }
  })
}

/**
 * 简单查询,selectSql为复杂查询
 * @param {String} name
 * @param {String} tabName
 * @param {Object} setData 
 * @param {String} byName 排序值
 * @param {String} byType 正序倒序
 */
function selectDataList(name, tabName, setData, byName, byType, path = "") {
  let setStr = ''
  let sql = ''
  if (JSON.stringify(setData) !== '{}') {
    let dataKeys = Object.keys(setData)
    dataKeys.forEach((item, index) => {
      console.log(setData[item])
      setStr += (
        `${item}=${JSON.stringify(setData[item])}${dataKeys.length - 1 !== index ? " and " : ""}`)
    })
    sql = `select * from ${tabName} where ${setStr}`
  } else {
    sql = `select * from ${tabName}`
  }
  if (byName && byType) {
    // desc asc
    sql += ` order by ${byName} ${byType}`
  }
  console.log(sql)

  return new Promise((resolve, reject) => {
    if (tabName !== undefined) {
      let isOpen = isOpenDB(name)
      if (isOpen) {
        plus.sqlite.selectSql({
          name: name,
          sql: sql,
          success: async (e) => {
            let a = await closeDB(name)
            resolve(e);
          },
          fail: async (e)=> {
            let a = await closeDB(name)
            reject(e);
          }
        })
      } else {
        plus.sqlite.openDatabase({
          name: name || 'test',
          path: path || `_doc/${name}.db`,
          success: function(res) {
            plus.sqlite.selectSql({
              name: name,
              sql: sql,
              success: async (e) => {
                let a = await closeDB(name)
                resolve(e);
              },
              fail: async (e)=> {
                let a = await closeDB(name)
                console.log(e)
                reject(e);
              
              }
            })

          },
          fail: async (e)=> {
            let a = await closeDB(name)
            console.log(e)
            reject(e);
          }
        });

      }

    } else {
      reject("错误")
    }
  });

}

// 获取数据库分页数据
/**
 * 
 * @param {*} name 
 * @param {*} tabName 
 * @param {*} num 页码
 * @param {*} size 页面大小返回条数
 * @param {*} byName 排序主键字段
 * @param {*} byType 排序类型 desc倒序 / asc正序
 */
async function queryDataList(name, tabName, num, size, byName, byType, path = "") {
  let count = 0
  let sql = ''
  let numindex = 0
  await queryCount(name, tabName).then((resNum) => {
    count = Math.ceil(resNum[0].num / size)
  })
  if (((num - 1) * size) == 0) {
    numindex = 0
  } else {
    numindex = ((num - 1) * size) + 1
  }
  sql = `select * from ${tabName}`
  if (byName && byType) {
    // desc asc
    sql += ` order by ${byName} ${byType}`
  }
  sql += ` limit ${numindex},${size}`
  return new Promise((resolve, reject) => {
    if (count < num - 1) {
      reject("无数据")
    } else {
      let isOpen = isOpenDB(name)
      if (isOpen) {
        plus.sqlite.selectSql({
          name: name,
          // sql: "select * from userInfo limit 3 offset 3",
          sql: sql,
          success: async (e)=> {
            let a = await closeDB(name)
            resolve(e);
          },
          fail: async (e)=> {
            let a = await closeDB(name)
            reject(e);
          }
        })
      } else {
        plus.sqlite.openDatabase({
          name: name,
          path: path || `_doc/${name}.db`,
          success: function(res) {
            plus.sqlite.selectSql({
              name: name,
              // sql: "select * from userInfo limit 3 offset 3",
              sql: sql,
              success: async (e)=> {
                let a = await closeDB(name)
                resolve(e);
              },
              fail: async (e)=> {
                let a = await closeDB(name)
                reject(e);
              }
            })
          },
          fail: async (e)=> {
            let a = await closeDB(name)
            reject(e);
          }
        });
      }
    }
  });

}

// 查询表数据总条数
function queryCount(name, tabName, path = "") {
  return new Promise((resolve, reject) => {
    let isOpen = isOpenDB(name)
    if (isOpen) {
      plus.sqlite.selectSql({
        name: name,
        sql: "select count(*) as num from " + tabName,
        success: async (e)=> {
          let a = await closeDB(name)
          resolve(e);
        },
        fail: async (e)=> {
          let a = await closeDB(name)
          reject(e);
        }
      })
    } else {
      plus.sqlite.openDatabase({
        name: name,
        path: path || `_doc/${name}.db`,
        success: function(res) {
          plus.sqlite.selectSql({
            name: name,
            sql: "select count(*) as num from " + tabName,
            success: async (e)=> {
              let a = await closeDB(name)
              resolve(e);
            },
            fail: async (e)=> {
              let a = await closeDB(name)
              reject(e);
            }
          })

        },
        fail: async (e)=> {
          let a = await closeDB(name)
          reject(e);
        }
      });
    }

  })
}

// 修改(更新)数据
// 示例:UPDATE COMPANY SET ADDRESS = 'Texas' WHERE ID = 6;
// UPDATE 表名 SET 要修改字段 = '修改内容' WHERE 筛选条件 = 6;
/**
 * 简单更新
 * @param {*} name 数据库名
 * @param {*} tabName 表名
 * @param {*} setData 设置值 (修改字段 + 修改内容)
 * @param {*} setName 筛选条件
 * @param {*} setVal 筛选值
 * @returns 
 */
function updateSqlData(name, tabName, setData, setName, setVal, path = "") {
  return new Promise((resolve, reject) => {
    if (JSON.stringify(setData) !== '{}') {
      let dataKeys = Object.keys(setData)
      let setStr = ''
      dataKeys.forEach((item, index) => {
        // console.log(item, setData[item])
        setStr += (
          `${item} = ${JSON.stringify(setData[item])}${dataKeys.length - 1 !== index ? "," : ""}`
        )
      })
      console.log(setStr)
      let isOpen = isOpenDB(name)
      if (isOpen) {
        plus.sqlite.executeSql({
          name: name,
          sql: `update ${tabName} set ${setStr} where ${setName} = "${setVal}"`,
          success: async (e)=> {
            let a = await closeDB(name)
            resolve(e);
          },
          fail: async (e)=> {
            let a = await closeDB(name)
            reject(e);
          }
        })
      } else {
        plus.sqlite.openDatabase({
          name: name,
          path: path || `_doc/${name}.db`,
          success: function(res) {
            plus.sqlite.executeSql({
              name: name,
              sql: `update ${tabName} set ${setStr} where ${setName} = "${setVal}"`,
              success: async (e)=> {
                let a = await closeDB(name)
                resolve(e);
              },
              fail: async (e)=> {
                let a = await closeDB(name)
                reject(e);
              }
            })

          },
          fail: async (e)=> {
            let a = await closeDB(name)
            reject(e);
          }
        });
      }

    } else {
      reject("错误")
    }
  });

}
//删除表
function deleteTable(dbName, table, path = "") {
  return new Promise((resolve, reject) => {
    let isOpen = isOpenDB(dbName)
    if (isOpen) {
      plus.sqlite.executeSql({
        name: dbName,
        sql: `DROP TABLE ${table}`,
        success: async (e)=> {
          let a = await closeDB(dbName)
          resolve(`删除表 ${table},成功`)
        },
        fail: async (e)=> {
          let a = await closeDB(dbName)
          reject(e);
        }
      });
    } else {
      plus.sqlite.openDatabase({ //如果数据库存在则打开,不存在则创建。
        name: dbName,
        path: path || `_doc/${dbName}.db`,
        success: function(e) {
          console.log('数据库打开成功');
          //执行 增\删\改 操作的SQL语句
          plus.sqlite.executeSql({
            name: dbName,
            sql: `DROP TABLE ${table}`,
            success: async (e)=> {
              let a = await closeDB(dbName)
              resolve(`删除表 ${table},成功`)
            },
            fail: async (e)=> {
              let a = await closeDB(dbName)
              reject(e);
            }
          });
        },
        fail: async (e)=> {
          let a = await closeDB(dbName)
          reject(e);
        }
      });
    }
  })
}
/**
 * @param {Object} dbName
 * @param {Object} dbsql 执行 增\删\改 操作的SQL语句
 */
function executeSql(dbName, dbsql, path = "") {
  console.log(dbsql);
  return new Promise((resolve, reject) => {
    // //判断数据库是否打开
    let bool = plus.sqlite.isOpenDatabase({
      name: dbName,
      path: path || `_doc/${dbName}.db`
    });
    if (bool) {
      plus.sqlite.executeSql({
        name: dbName,
        sql: dbsql,
        success: async (e)=> {
          let a = await closeDB(dbName)
          resolve(e)
        },
        fail: async (e)=> {
          let a = await closeDB(dbName)
          reject(e);
        }
      });
    } else {
      plus.sqlite.openDatabase({ //如果数据库存在则打开,不存在则创建。
        name: dbName,
        path: path || `_doc/${dbName}.db`,
        success: function(e) {
          console.log('数据库打开成功');
          //执行 增\删\改 操作的SQL语句
          console.log(dbsql);
          plus.sqlite.executeSql({
            name: dbName,
            sql: dbsql,
            success: async (e)=> {
              let a = await closeDB(dbName)
              resolve(e)
            },
            fail: async (e)=> {
              let a = await closeDB(dbName)
              reject(e);
            }
          });
        },
        fail: async (e)=> {
          let a = await closeDB(dbName)
          reject(e);
        }
      });
    }
  })
}

/**
 * @param {Object} dbName
 * @param {Object} selectNcDuli
 */
function selectSql(dbName, selectNcDuli, path = "") {
  return new Promise((resolve, reject) => {
    let bool = plus.sqlite.isOpenDatabase({
      name: dbName,
      path: path || `_doc/${dbName}.db`
    })
    console.log(bool);
    if (bool) {
      plus.sqlite.selectSql({
        name: dbName,
        sql: selectNcDuli,
        success: async (e)=> {
          let a = await closeDB(dbName)
          resolve(e)
        },
        fail: async (e)=> {
          let a = await closeDB(dbName)
          reject(e);
        }
      });
    } else {
      plus.sqlite.openDatabase({
        name: dbName, //这里是数据库的名称
        path: path || `_doc/${dbName}.db`, //_doc是相对路径的应用私有文档目录
        success: function(e) {
          //查询数据
          plus.sqlite.selectSql({
            name: dbName,
            sql: selectNcDuli,
            success: async (e)=> {
              let a = await closeDB(dbName)
              resolve(e)
            },
            fail: async (e)=> {
              let a = await closeDB(dbName)
              reject(e);
            }
          });
        },
        fail: async (e)=> {
          let a = await closeDB(dbName)
          reject(e);
        }
      });
    }
  })
}

//关闭数据库
function closeDB(dbName) {
  return new Promise((resolve, reject) => {
    plus.sqlite.closeDatabase({
      name: dbName,
      success: function(e) {
        console.log('数据库关闭成功');
        resolve(true)
      },
      fail: function(e) {
        console.log('数据库关闭失败');
        reject(false)
      }
    });
  })

}
export const db = {
  openDB,
  closeDB,
  isOpenDB,
  queryDBTable,
  createTable,
  isTable,
  deleteTable,
  addSaveData,
  selectDataList,
  queryCount,
  updateSqlData,
  queryDataList,
  executeSql,
  selectSql,
}

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