java|java mybatis如何操作postgresql array数组类型 javamybatis如何操作postgresqlarra

我定义了几个基础数据类型的数组
java mybatis操作 postgresql array数组类型备忘

找了半天没有找到postgresql中关于array数组类型的字段如何对应到java中的数据类型，后来找到了mybatis的TypeHandler，只要实现一个自定义的TypeHandler就行了，如下，

我定义了几个基础数据类型的数组

public class ArrayTypeHandler extends BaseTypeHandler {private static final String TYPE_NAME_VARCHAR = "varchar"; private static final String TYPE_NAME_INTEGER = "integer"; private static final String TYPE_NAME_BOOLEAN = "boolean"; private static final String TYPE_NAME_NUMERIC = "numeric"; @Overridepublic void setNonNullParameter(PreparedStatement ps, int i, Object[] parameter, JdbcType jdbcType) throws SQLException {String typeName = null; if (parameter instanceof Integer[]) {typeName = TYPE_NAME_INTEGER; } else if (parameter instanceof String[]) {typeName = TYPE_NAME_VARCHAR; } else if (parameter instanceof Boolean[]) {typeName = TYPE_NAME_BOOLEAN; } else if (parameter instanceof Double[]) {typeName = TYPE_NAME_NUMERIC; }if (typeName == null) {throw new TypeException("ArrayTypeHandler parameter typeName error, your type is " + parameter.getClass().getName()); }// 这3行是关键的代码，创建Array，然后ps.setArray(i, array)就可以了Connection conn = ps.getConnection(); Array array = conn.createArrayOf(typeName, parameter); ps.setArray(i, array); }@Overridepublic Object[] getNullableResult(ResultSet resultSet, String s) throws SQLException {return getArray(resultSet.getArray(s)); }@Overridepublic Object[] getNullableResult(ResultSet resultSet, int i) throws SQLException {return getArray(resultSet.getArray(i)); }@Overridepublic Object[] getNullableResult(CallableStatement callableStatement, int i) throws SQLException {return getArray(callableStatement.getArray(i)); }private Object[] getArray(Array array) {if (array == null) {return null; }try {return (Object[]) array.getArray(); } catch (Exception e) {}return null; }}

然后在实体类里面对应的字段配置这个转换器就行，如果是配置文件需要在 xxmap.xml中配置对应属性

@ColumnType(typeHandler = com.mvc.typehandler.ArrayTypeHandler.class)private String[] cities; //所操作的城市code列表，为空表示所有城市@ColumnType(typeHandler = com.mvc.typehandler.ArrayTypeHandler.class)private String[] areaTypes; //操作的行业类型code列表，为空表示所有行业@ColumnType(typeHandler = com.jmtool.mvc.typehandler.ArrayTypeHandler.class)private Integer[] targetStatus; //操作的目标数据状态

java mybatis操作 postgresql array数组类型备忘 postgrey sql数据库字段类型varchar[],java使用String[]类型，自定义ArrayTypeHandler
ArrayTypeHandler.java

public class ArrayTypeHandler extends BaseTypeHandler {private static final String TYPE_NAME_VARCHAR = "varchar"; private static final String TYPE_NAME_INTEGER = "integer"; private static final String TYPE_NAME_BOOLEAN = "boolean"; private static final String TYPE_NAME_NUMERIC = "numeric"; @Overridepublic void setNonNullParameter(PreparedStatement ps, int i, Object[] parameter, JdbcType jdbcType) throws SQLException {String typeName = null; if (parameter instanceof Integer[]) {typeName = TYPE_NAME_INTEGER; } else if (parameter instanceof String[]) {typeName = TYPE_NAME_VARCHAR; } else if (parameter instanceof Boolean[]) {typeName = TYPE_NAME_BOOLEAN; } else if (parameter instanceof Double[]) {typeName = TYPE_NAME_NUMERIC; }if (typeName == null) {throw new TypeException("ArrayTypeHandler parameter typeName error, your type is " + parameter.getClass().getName()); }// 这3行是关键的代码，创建Array，然后ps.setArray(i, array)就可以了Connection conn = ps.getConnection(); Array array = conn.createArrayOf(typeName, parameter); ps.setArray(i, array); }@Overridepublic Object[] getNullableResult(ResultSet resultSet, String s) throws SQLException {return getArray(resultSet.getArray(s)); }@Overridepublic Object[] getNullableResult(ResultSet resultSet, int i) throws SQLException {return getArray(resultSet.getArray(i)); }@Overridepublic Object[] getNullableResult(CallableStatement callableStatement, int i) throws SQLException {return getArray(callableStatement.getArray(i)); }private Object[] getArray(Array array) {if (array == null) {return null; }try {return (Object[]) array.getArray(); } catch (Exception e) {}return null; }}

配置文件中映射配置，增加typeHandler属性，填写ArrayTypeHandler.java的全路径。

用到的SQL：